A change made to the Stryker infantry vehicle has proven itself in combat. The 3rd Brigade, 2nd Infantry Division – also called Task Force Olympia after its Fort Lewis, Wash., home -- is replacing the 101st Airborne Division in this city. The Stryker, an eight-wheeled infantry transporter, is an armored vehicle designed to stop 124.5 mm rounds. Critics said the main threat in Iraq is rocket-propelled grenades, and that the vehicle would not provide protection from them. Army officials outfitted the Strykers with what the soldiers call a "cage." The slat armor put on the vehicles in Kuwait does look...